[kuh n-tak-tuh nt] /kənˈtæk tənt/ noun, Medicine/Medical. 1. any substance that might induce an allergy by coming in with the skin or a mucous membrane. contactant con·tac·tant (kən-tāk’tənt) n. Any of a group of allergens that elicit manifestations of induced sensitivity by direct contact with the skin or mucosa.

noun, Astronomy. 1. a binary system in which the envelopes of gas surrounding each star are in contact.

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